[ARC5] [Milsurplus] I Must Have Lost My Mind...

Mon Aug 12 11:53:19 EDT 2019

Because of the way the keying is designed in the GO-* and GP-* sets.  
With a relatively high frequency power source, the designers keyed the 
primary (115vac) side of the high voltage supply, with only a 1Hy and 
2ufd filter capacitor needed.  You would have to come up with another 
way of keying the transmitter if you didn't want to use 800Hz (or 
higher...) primary power.  People did, and if it's yours you can do with 
it what you wish, but others consider it a challenge to get it to work 
as intended.  I fall into the latter group.

  - Mike  KC4TOS

On 8/12/2019 11:19 AM, D C _Mac_ Macdonald wrote:
> However, as I suggested, why could not the radio be operated from 
> external supplies that provide the necessary voltages and currents?
>
> ------------------------------------------------------------------------
> *From:* Meir WF2U <wf2u at ws19ops.com>
> *Sent:* Monday, August 12, 2019 10:15
> *To:* D C _Mac_ Macdonald <k2gkk at hotmail.com>
> *Cc:* ARC-5 list <arc5 at mailman.qth.net>; Milsurplus 
> <milsurplus at mailman.qth.net>; Robert Downs <wa5cab at cs.com>
> *Subject:* Re: [ARC5] [Milsurplus] I Must Have Lost My Mind...
> The whole power supply (HV, etc) works off 800 Hz, because of the 800 
> Hz transformers.
> The design rationale was weight and size saving on the transformers as 
> opposed to 60 or even 400 Hz line. The motor-generator is lighter 
> also, as the generator needs less iron. The primary current to run the 
> motor-generator was DC.
> Later development standardized the AC current on aircraft at 400 Hz.
>
>
> 73, Meir WF2U
> Landrum, SC
>
> Sent from BlueMail <http://www.bluemail.me/r?b=15487>
> On Aug 12, 2019, at 10:53 AM, D C _Mac_ Macdonald <k2gkk at hotmail.com 
> <mailto:k2gkk at hotmail.com>> wrote:
>
>     While I am not at all familiar with this equipment, how much
>     ACTUAL 800 Hz AC is required?  Can the high voltages be supplied
>     with power supplies running on "normal" 60 Hz AC and the actual
>     portions that require the 800 Hz supply run from a much less
>     robust source?
>
>     The same question and suggestion above could easily be applied to
>     other military gear that requires a high frequency supply for
>     small portions of its overall load.
>
>     73 de Mac, K2GKK/5
>     Since 30 Nov 1953
>     Oklahoma City, OK
>     USAF, Retired ('61-'81)
>     FAA, Retired ('94-'10)
>     ------------------------------------------------------------------------
>     *From:* arc5-bounces at mailman.qth.net
>     <arc5-bounces at mailman.qth.net> on behalf of Robert Downs via ARC5
>     <arc5 at mailman.qth.net>
>     *Sent:* Monday, August 12, 2019 00:24
>     *To:* 'ARC-5' <arc5 at mailman.qth.net>; 'milsurplus at mailman'
>     <milsurplus at mailman.qth.net>
>     *Subject:* Re: [ARC5] [Milsurplus] I Must Have Lost My Mind...
>
>     Unfortunately, 400 watts is inadequate.  600 watts is about the
>     minimum if you don’t want to have to nursemaid the inverter.  I
>     have some PE-206-C’s that are rated 500 watts continuous output
>     and am told that they won’t quite run a GP-6, -6a or -7 to full
>     output on high power.
>
>     Robert Downs
>
>     *From:*arc5-bounces at mailman.qth.net
>     [mailto:arc5-bounces at mailman.qth.net] *On Behalf Of *spr at earthlink.net
>     *Sent:* Sunday, August 11, 2019 20:27
>     *To:* Bart Lee; Roy Morgan
>     *Cc:* ARC-5; milsurplus at mailman
>     *Subject:* Re: [ARC5] [Milsurplus] I Must Have Lost My Mind...
>
>     400W class D (switching) audio power amps are not hard to find.
>     Audio oscillators likewise.
>
>     /scott
>
>         -----Original Message-----
>         From: Bart Lee
>         Sent: Aug 11, 2019 3:54 PM
>         To: Roy Morgan
>         Cc: ARC-5 , "milsurplus at mailman"
>         Subject: Re: [ARC5] [Milsurplus] I Must Have Lost My Mind...
>
>         "Unobtainium 800 cycle inverter possible."
>
>         Has anybody created use-able 800 cycle power other than by
>         motor-generator?
>
>         Maybe aviation maintenance equipments?
>
>         A high power audio amp with a 555 oscillator?
>
>         Frequency Doubler-Double-Doubler high power diode circuits?
>
>         A couple of AN/APA-38 Panoramic Adaptors (30 MHz) would like
>         to know...
>
>         73 de Bart, K6VK ##
>
>         -- --
>
>         Bart Lee, K6VK, CHRS, AWA, ARRL
>
>         Texts only to: 415 902 7168
>
>         www.bartlee.com
>         <https://eur04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.bartlee.com%2F&data=02%7C01%7C%7Cbe3350f59eb24875cf1608d71ee55efa%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637011842804059277&sdata=dcYHttWX0YH4kDm0VAO45F5SNj%2BwbDG24T6pJK8hcn8%3D&reserved=0>
>
>
>         {Bart(dot)Lee(dot)K6VK(at)gmail(dot)com}
>
>         On Sun, Aug 11, 2019 at 2:05 PM Roy Morgan <k1lky68 at gmail.com
>         <mailto:k1lky68 at gmail.com>> wrote:
>
>             If there is someone out there who REALLY wants one, talk
>             to me.
>
>             Aircraft sourced separately.
>
>             Unobtainium 800 cycle inverter possible.
>
>             Roy sends.
>
>
>             On Aug 11, 2019, at 12:16 PM, David Stinson
>             <arc5 at ix.netcom.com <mailto:arc5 at ix.netcom.com>> wrote:
>
>                 It's a Westinghouse GO-9 U.S. Navy Liaison
>                 transmitter, circa 1940.
>                 100 Watts out, CW Only, runs on 800 cycle AC like the
>                 later GP-7.  |
>                 On the left is the Power Supply, 2000V and 500V.
>                 On the right is the High Frequency transmitter module,
>                 3-18 MC.
>                 Missing to the left of the power supply is the
>                 Longwave transmitter
>                 module.   Often installed in pre- and early-war PBY
>                 patrol aircraft.
>                 Most PBY Radio photos you find at Google are from
>                 later, with
>                 the AN/ARC-8 installed.
>
>                 Good overview on Mike Hanz's excellent site:
>                 http://aafradio.org/flightdeck/go9.htm
>                 <https://eur04.safelinks.protection.outlook.com/?url=http%3A%2F%2Faafradio.org%2Fflightdeck%2Fgo9.htm&data=02%7C01%7C%7Cbe3350f59eb24875cf1608d71ee55efa%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637011842804059277&sdata=aHuIi0%2FnOZV67Xfl5rnUMsqNwTQ3DEcrlyoKa1BwKJY%3D&reserved=0>
>
>                 <hcfebcikfbochamk.jpg>
>
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>                 	
>
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-- 
Michael Hanz - KC4TOS

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